Home / 20,789.87-28,686.15-11,840.18

Finding the Fourth Proportional to 20,789.87, 28,686.15 and 11,840.18

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Solution

The fourth proportional to 20,789.87, 28,686.15 and 11,840.18 is: 16,337.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.87 : 28,686.15 = 11,840.18 : x
  2. Step 2: Convert to fraction form
    20,789.87/28,686.15 = 11,840.18/x
  3. Step 3: Cross multiply
    20,789.87x = 28,686.15 × 11,840.18
  4. Step 4: Simplify right side
    20,789.87x = 339,649,036.08
  5. Step 5: Solve for x
    x = 339,649,036.08/20,789.87
  6. Step 6: Final answer
    x = 16,337.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.